your institutional logo. MAP Design & Simulation Overview Richard Fernow Brookhaven National Laboratory Muon Accelerator Program Review Fermilab 24 August 2010

your institutional logo Design & Simulation Goals 2MAP REVIEW August, 2010Richard Fernow Design & Simulation (D&S) is one of three major efforts in MAP primary goals are to provide needed D&S effort to - produce a design report for a neutrino factory (NF) by FY14 - determine feasibility of a multi-TeV muon collider (MC) by FY16 provide detailed description of major facility subsystems optimize subsystem performance do end-to-end simulations of beam behavior estimate uncertainties in performance & tolerances in machine parameters provide required part counts for preliminary costing identify items that need additional R&D

your institutional logo Present Design Configurations 3MAP REVIEW August, 2010Richard Fernow MC NF proton driver4 MW, upgraded Project Xsame targetliquid Hg jet in 20 Tsame front end channelenhanced Study 2asame 6D cooling3 good candidates --- final coolinghigh field solenoid --- LE μ accelerationlinac + 2 RLA + FFAGsame HE μ accelerationrapid-cycling synchrotrons --- final ring2.5 km collider, β* = 1 cmracetrack, long straight performance≥ / cm 2 s10 21 total μ decays/yr for both signs Schematic Not to scale

your institutional logo Example 1.5 TeV MC parameters 4MAP REVIEW August, 2010Richard Fernow proton driver energy (GeV)8 proton driver power (MW)4 proton driver repetition rate (Hz)15 μ beam energy (TeV)0.75 μ per bunch (10 12 )2 ε TN (μm)25 ε LN (mm)70 energy spread in collider ring (%)0.1 β* (cm)1 Avg. luminosity (10 34 cm -2 s -1 )1.25

your institutional logo MAP Level 2 D&S Organization 5MAP REVIEW August, 2010Richard Fernow 1. Proton Driver - Keith Gollwitzer, FNAL, head of Antiproton Source Dept. 2. Front End - Harold Kirk, BNL, co-spokesperson MERIT targetry experiment 3. Cooling - Tom Roberts, Muons Inc., author of G4beamline code 4. Acceleration - J. Scott Berg, BNL, accelerator convener for IDS-NF 5. Collider Ring - Yuri Alexahin, FNAL, head of APC Theory/Simulation Dept. 6. Machine-Detector Interface (MDI) - Nikolai Mokhov, FNAL, head of APC Energy Deposition Dept., MARS code

your institutional logo Proton Driver Status 6MAP REVIEW August, 2010Richard Fernow PD group closely follows developments on Project X compatibility with NF/MC is one of the Project X design requirements MAP effort addresses upgrades needed to meet NF and MC specs initial design done by Muons Inc with funding from Project X more detailed recent work is being done by V. Lebedev present concept - Project X upgrade to ~4 MW - accumulator, compressor rings for proton bunch structure - trombone & funnel optics at target for MC (cf. Keith Gollwitzer talk) Linac

your institutional logo Proton Driver R&D Tasks 7MAP REVIEW August, 2010Richard Fernow increasing power of Project X beam to 4 MW - study increasing Project X current, pulse duration, rep rate injection into the accumulator ring - study accumulating many turns via charge-stripping of H - beam - feasibility of stripping techniques - methods to prevent overheating producing a ~2 ns rms proton bunch at the target - challenging goal for 8 GeV, high intensity beam - design bunch compression ring - design trombone & funnel optics to target R&D issues for all Level 2 areas are covered more completely in the parallel session talks and in the technical document

your institutional logo Front End Status: target 8MAP REVIEW August, 2010Richard Fernow front end ≡ target system + beam channel target system ≡ Hg jet target + tapered solenoid +shielding + beam dump + infrastructure - have a well-developed concept - many details benchmarked by the MERIT experiment ongoing effort on MHD simulations FRONTIER simulation (cf. Kirk McDonald talk)

your institutional logo Front End Status: beam channel 9MAP REVIEW August, 2010Richard Fernow FE beam channel ≡ decay channel + buncher + phase rotation + NF cooling problems with RF in magnetic field complicates these designs (cf. Alan Bross talk) 1. maximum gradient in vacuum-filled cavities falls off with increasing B 2. gradient OK in gas-filled cavities, but effects of intense beam unknown this has required studying many modified channel designs e.g., gas-filling (hybrid), magnetic insulation, bucked lattices baseline is a new shorter bunching & phase rotation channel design for 8 GeV (cf. Harold Kirk talk)

your institutional logo Front End R&D Tasks 10MAP REVIEW August, 2010Richard Fernow understand shape distortions and possible cavitation in the Hg jet shielding the superconducting magnets near the target - reduce heat loads on cryogenic system target facility engineering design - e.g., magnets, dump, beam windows, mercury plumbing, remote handling compare pion production codes, benchmark to HARP, MIPP understanding RF breakdown mechanisms - effect of magnetic field on vacuum-filled cavities - effect of beam on gas-filled cavities adopt solution to RF breakdown problem in channel design

your institutional logo Ionization Cooling 11MAP REVIEW August, 2010Richard Fernow our proposed technique for cooling muon beams is ionization cooling cooling from dE/dx, heating from scattering ε TN eq ~ β T / (β L R dE/dx) want strong focusing → low β T hydrogen and LiH used for absorbers typical μ momentum ~ 200 MeV/c longitudinal cooling requires emittance exchange requires a dispersive channel heating from straggling, curvature of dE/dx Dispersion in magnet

your institutional logo Cooling Overview 12MAP REVIEW August, 2010Richard Fernow cooling by ~10 6 in ε 6N is one of most challenging requirements for MC cooling systems ≡ 6D cooling + final transverse cooling + auxiliary systems auxiliary system - charge separation & recombination - bunch merging we have written new codes, ICOOL & G4beamline, to study cooling we have developed several scenarios for reaching this cooling goal Example cooling scenario

your institutional logo Cooling Status: 6D cooling 13MAP REVIEW August, 2010Richard Fernow we have three potential designs for 6D cooling (cf. Tom Roberts talk) - Guggenheim easy engineering access - Helical Cooling Channel (HCC) gas may allow using high RF gradient - Helical FOFO-snake transmits both charges simulations show we can reach ε TN ~ 0.4 mm, ε LN ~ 1 mm with Guggenheim and HCC channels Guggenheim HCC FOFO-snake

your institutional logo Cooling Status: final cooling 14MAP REVIEW August, 2010Richard Fernow a high-field solenoid channel can provide required final cooling - preliminary simulations with 40 and 50 T show it can reach ε TN =25 μm goal - transmission is reduced at 40 T, but it still looks acceptable other options - Parametric Ionization Cooling channel + REMEX - Li lens channel 40- (cf. Bob Palmer talk)

your institutional logo Cooling R&D Tasks 15MAP REVIEW August, 2010Richard Fernow incorporate solution to problem of RF in magnetic field in cooling channel designs understand dependence of final cooling channel performance on the solenoid field strength design auxiliary cooling systems - charge separation with bent solenoid channel will probably work - compare bunch recombination with planar wigglers and helical channels simulation code development - upgrade ICOOL and G4beamline to follow cooling developments do end-to-end simulation of cooling channel - simulate all missing stages of channel, auxiliary systems, matching sections - all simulations done with a consistent level of detail

your institutional logo μ Acceleration Status 16MAP REVIEW August, 2010Richard Fernow have a 25 GeV accelerator design for IDS-NF (cf. Scott Berg talk) Rapid Cycling Synchrotron (RCS) is preferred choice for the high energy (750 GeV) accelerator - gives large number of passes through RF system RLA is other option for high energy acceleration RCS half-cell dipoles oppose at injection act in unison at extraction

your institutional logo μ Acceleration R&D Tasks 17MAP REVIEW August, 2010Richard Fernow study feasibility of 25 GeV accelerator design for MC and NF study feasibility of RCS concept for high energy acceleration design auxiliary accelerator systems - e.g., injection, extraction, RF study effects of muons in a bunch - loading RF cavities, wakefields

your institutional logo Collider Ring Status 18MAP REVIEW August, 2010Richard Fernow have a preliminary 1.5 TeV collider ring design (cf. Yuri Alexahin talk) looks encouraging so far: large momentum acceptance, good dynamic aperture helped by μ lifetime limits us to ~1000 turns working with SciDAC group on beam-beam simulations Recent collider ring example

your institutional logo Collider Ring R&D Tasks 19MAP REVIEW August, 2010Richard Fernow beam dynamics studies - higher order chromaticity, tracking with fringe fields study feasibility of obtaining β* = 1 cm - effects of alignment, jitter, other errors - beam-beam effects examine effects of electrons from μ decays - study heat load, radiation damage design auxiliary ring systems - RF, injection, abort, diagnostics, …

your institutional logo Machine-Detector Interface Status 20MAP REVIEW August, 2010Richard Fernow MDI group was set up to coordinate work on - collider ring design - detector design - physics analysis - ring magnet design requires iterating separate designs until they work together have made a preliminary MARS15 model of IR

your institutional logo Machine-detector interface R&D Tasks 21MAP REVIEW August, 2010Richard Fernow simulation of radiation levels - determine component lifetime, heating design of IR absorber cones - detector background control of beam halo - can ’ t collimate, need deflection system design of auxiliary IR systems - beam pipe, cryogenics quantify significance of off-site neutrino-induced radiation - should be OK at 1.5 TeV

your institutional logo Down-selection for D&S 22MAP REVIEW August, 2010Richard Fernow we have an initial NF machine configuration now some MC systems still have several possible technical choices MAP plan aims to specify a single MC configuration by using a series of down-selection milestones formal procedure is described in the MAP proposal, including - technical review of simulated performance, engineering feasibility, relative costs - MAP Director makes final decision this will lead to a single design configuration for MC in FY13 each milestone has corresponding deliverable - technical report summarizing the case for various options

your institutional logo D&S Milestones & Deliverables 23MAP REVIEW August, 2010Richard Fernow DateMilestone Deliverable FY10specify target initial configurationMAP Rev, Des Report FY11specify front end initial configuration specify NF μ acceleration initial configuration MAP Rev, Des Report FY12specify collider ring initial configuration specify cooling initial configuration Ext Rev, Des Report MAP Rev, Des Report FY13specify proton driver initial configuration specify MC μ acceleration initial configuration Ext Rev, Des Report MAP Rev, Des Report FY14finish D&S for Interim MC DFS report finish D&S for Final IDS-NF RDR report Formal Report FY15provide specifications & parts count for MC costingDesign Report FY16provide description of remaining MC R&D items finish D&S for Final MC DFS report Design Report Formal Report

your institutional logo D&S funding profile 24MAP REVIEW August, 2010Richard Fernow D&S costs are predominantly for personnel M&S is for travel, workshops total funding peaks at 5.8 M$ in FY13 includes funding for cost estimation, peaking in FY16

your institutional logo FTE Plan for NF D&S 25MAP REVIEW August, 2010Richard Fernow areaFY10*FY11FY12FY13FY14FY15FY16total D&S site targetry total FY11 additions engineer – NF site geology at Fermilab engineer – target systems postdoc – NF front end & μ acceleration * actual FTE plans were determined from task effort estimations and effort on previous studies

your institutional logo FTE Plan for MC D&S 26MAP REVIEW August, 2010Richard Fernow areaFY10*FY11FY12FY13FY14FY15FY16total PD FE cool accel ring MDI total we believe the required rate of growth for plan is achievable FY11 additions postdoc ― collider ring & MDI postdoc ― proton driver & MC acceleration * actual

your institutional logo Summary 27MAP REVIEW August, 2010Richard Fernow MAP plan for D&S addresses major issues for design of NF and MC have assembled experienced leadership team to guide this effort sufficient resources are available in the plan to reach our goals by FY16 D&S milestones and Interim Design Reports will allow us to adequately monitor our progress this work will provide valuable input to particle physics community about viability of NF and MC options for future physics research